oh wow, that truly astonished me in ways words cannot explain!
Answer:
Oh wow!
Explanation:
A student was holding a metal rod to a candle flame. After a while he noticed that his hand was getting hot.
a. Radiation
b. Conduction
c. Convection
d. Transformation
Answer:
Conduction
Explanation:
Conduction is when energy directly travels through a solid to get from one point to another.
A student was holding a metal rod to a candle flame. After a while, he noticed that his hand was getting hot due to conduction.
What is conduction?
The definition of conduction is the movement of something together with warmness or energy through a medium or passage. An instance of conduction is using a metallic rod to roast marshmallows on an open hearth and feeling the warmth rise through the rod from the fire for your hand.
What are 4 examples of conduction?A lizard warming its belly on a hot rock.Touching a hot seatbelt when you get into a car.A blacksmith heating up a sword in hot coals, and the heat transferring up through the metal.The heat from the stovetop transfers into a metal pot of water.
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What common factor is responsible for three of the
four erosional processes pictured?
A. wind
B. heat
C. human intervention
D. gravity
Answer:
D. gravity
hope this helps
what is a stethoscope
Explanation:
A stethoscope is used to listen to sounds that the heart , lungs , blood flow , intestines make.
SO3 is a covalent compound with no lone pairs on the central S atom. What's the structure of a molecule of SO3? Is an SO3 molecule polar or non-polar?
Question 14 options:
A)
Trigonal planar, non-polar
B)
Trigonal pyramidal, polar
C)
Trigonal planar, polar
D)
Trigonal pyramidal, non-polar
Answer:
A
Explanation:
it has non polar molecule, because it has the equal sharing of electrons, so equal repulsion from all sides. atoms are equally represented.
Answer:
Trigonal planar, non-polar
Explanation:
A student measures the length of two pieces of paper as 8.21 in
and 8.0 in. What is the total length? Be sure to use sig. figs. in
your answer. Do not include the unit.
Answer: 16.21
Explanation:
A student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21 with 4 significant figures.
What are significant figures?
The significant figures or digits are the form of scientific methd which represent the digit from zero to nine and use when the value is uncertain where starting zeros are not significant and decimal is also not a significant figure.
In the given value the total is 16.21 with 4 significant figures with it has 4 significant digits and the decimal with it is not significant after adding from which the respective value is here.
Therefore, with 4 significant figures where the student measures the length of two pieces of paper as 8.21 in and 8.0 in. the total length is 16.21.
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Most of the elements on the Periodic Table are found in nature as
Help??
How many grams of sodium chloride decompose to yield 15 grams of chlorine gas?
2NaCl → 2Na+ Cl2
A- 12.363 9 Naci
B- 49.453 g Naci
C- 30 g NaCl
D- 0.846 g Naci
Answer:
Mass of sodium chloride decomposed = 24.54 g
Explanation:
Given data:
Mass of sodium chloride decomposed = ?
Mass of chlorine gas formed = 15 g
Solution:
Chemical equation:
2NaCl → 2Na + Cl₂
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 15 g/ 71 g/mol
Number of moles = 0.21 mol
Now we will compare the moles of Cl₂ with NaCl from balance chemical equation.
Cl₂ : NaCl
1 : 2
0.21 : 2×0.21 = 0.42 mol
Mass of Sodium chloride decompose:
Mass = number of moles × molar mass
Mass = 0.42 mol × 58.44 g/mol
Mass = 24.54 g
Europium orbital diagram
A 100.0 lb skier moves at 40.00miles/hour. Calc her kinetic energy.
answer: its 7290 joules.
explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x
hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.
KE= 1/2 * 45 * (18)^2
= 1/2 * 45 * 14580
= 7290joules
The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group 5A (red). In this representation, each Y atom needs electron(s) to complete its octet, and gains these electrons by forming bond(s) with atoms of H . There are unshared electron pair(s) and bonding electron pair(s) in the product molecule. The bonds in the product are _________ .
Answer:
Each Y atom needs three electrons to complete its octet by forming three bonds to hydrogen. There is one unshared pair of electrons and three bonding pairs of electrons. The bonds in the product are covalent.
Explanation:
Recall that group 5A elements contain five electrons in their outermost shell. These five electrons consists of a lone pair and three electrons that can form three bonds with hydrogen to give YH3 where Y is the group 5A element.
The YH3 molecule contains one lone(unshared) pair of electrons as well as three bonding pairs of electrons. The compounds are covalent.
What is the formula for Copper i Monohydrogen Phosphate?
Answer:
Na2HPO4
Explanation:
The chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.
Let's break down the formula to understand it better:
1. "Cu" represents copper, which is an element with the atomic symbol Cu. Copper is a transition metal that is commonly used in electrical wiring and plumbing.
2. "H" represents hydrogen, which is an element with the atomic symbol H. Hydrogen is the lightest and most abundant element in the universe.
3. "PO₄" represents the phosphate ion, which is composed of one phosphorus atom (P) and four oxygen atoms (O). The phosphate ion is commonly found in biological systems and is an essential component of DNA, RNA, and ATP.
So, when combined one copper atom (Cu), one hydrogen atom (H), and one phosphate ion (PO₄), get the formula CuHPO4, which represents Copper I Monohydrogen Phosphate.
It's important to note that the "I" in Copper I refers to the charge of the copper ion in this compound. Copper can form different ions with different charges, and the Roman numeral indicates the charge of the copper ion in this particular compound.
Thus, chemical formula for Copper I Monohydrogen Phosphate is CuHPO₄.
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Everything in outer space including stars, planets, and galaxies
O A. Solar System
B. Universe
OC. Galaxy
D. Biosphere
I
Answer:
Universe.
Explanation:
Biosphere is just a planet. Solar system contains planets and star. Galaxy holds multiple solar systems only. Universe hold everything, biospheres, solar systems, and galaxies. I hope this helps :D
Answer:
B.
Explanation:
A solar system is IN a galaxy. Its not A.
A Galaxy doesnt have other galaxies in it. Its not c
A biosphere is only referring to earth. its not D.
Therefore, it is B. A universe is everything in outer space including stars, planets, and galaxies.
Part C
What is a useful application for this new material?
Answer:
The new material Emily invented allows scratches to be repaired quickly, so it would be useful on cars and other surfaces that experience a lot of wear.
Explanation:
I got this right on Plato\Edmentum
Answer:
The new material Emily invented allows scratches to be repaired quickly, so it would be useful on cars and other surfaces that experience a lot of wear.
Explanation:
nitric acid, HNO3, and calcium hydroxide, Ca(OH)2
net ionic equation:
Answer:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
General Formulas and Concepts:
Solubility RulesStrong Acids/BasesExplanation:
Step 1: RxN
HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)
Step 2: Balance RxN
2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)
Step 3: Ionic Equations
Total Ionic Equation:
2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)
Cancel out spectator ions.
Net Ionic Equation:
2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)
how many grams are there in 2.3x10^24 atoms of silver
412.056524g is present in 2.3×10^24atoms of Ag
1.) A laser emits light of frequency 3.72 x 1014 /s. What is the wavelength of the light in m?
2.) Calculate the energy, in joules, of a single photon associated with frequency of 4.00x105/s
3.) Determine the frequency and energy of a photon whose wavelength is 2.57x10-7 m
explanation and work needed please
Answer:
1. λ = 806nm
2. E = 2.6504 × 10^-28J
3. a) f = 1.167 × 10^15 Hz
b) E = 7.73 × 10^-19J
Explanation:
1) The wavelength denoted by λ can be calculated using the formula:
λ = v / f
Where;
v = speed of light (3×10^8m/s)
f = frequency of light (Hz)
λ = 3 × 10^8/3.72 x 1014
λ = 0.80645 × 10^(8-14)
λ = 0.80645 × 10^-6
λ = 8.06 × 10^-7m
λ = 806nm
2) The energy (J) of a photon is calculated thus;
E = hf
Where;
h = Planck's constant (6.626 × 10^-34J/s)
f = frequency (4.00x10^5/s)
E = 6.626 × 10^-34 × 4.00x10^5
E = 26.504 × 10^(-34+5)
E = 26.504 × 10^-29
E = 2.6504 × 10^-28J
3. λ = v / f
2.57x10^-7 = 3 × 10^8 ÷ f
f = 3 × 10^8/2.57x10^-7
f = 1.167 × 10^(8+7)
f = 1.167 × 10^15 Hz
b) E = hf
E = 6.626 × 10^-34 × 1.167 × 10^15
E = 7.7325 × 10^(-34+15)
E = 7.73 × 10^-19J
Write the balanced net ionic equation for the reaction of aqueous sodium sulfate with aqueous lead(II) nitrate. Include phases.
net ionic equation:
Answer:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
General Formulas and Concepts:
Solubility RulesExplanation:
Step 1: RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + NaNO₃ (aq)
Step 2: Balance RxN
Na₂SO₄ (aq) + Pb(NO₃)₂ (aq) → PbSO₄ (s) + 2NaNO₃ (aq)
Step 3: Ionic Equations
Total Ionic Equation:
2Na⁺ (aq) + SO₄²⁻ (aq) + Pb²⁺ (aq) + 2NO₃⁻ → PbSO₄ (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq)
Cancel out spectator ions.
Net Ionic Equation:
SO₄²⁻ (aq) + Pb²⁺ (aq) → PbSO₄ (s)
According to valence bond theory, which atomic orbitals of carbon may be hybridized to account for bonding? Why?
.
A. Only 2p orbitals may hybridize; the 2p orbital is carbon’s highest-energy atomic orbital.
B. Only 1s and 2s orbitals of carbon may hybridize; each contains electrons to share in bonding.
C. Only 2s and 2p may hybridize; these orbitals contain valence electrons used in bonding.
D. Only 2s orbitals may hybridize; these orbitals contain valence electrons.
E. 1s, 2s, and 2p orbitals all may hybridize; these orbitals are of the same phase
Answer:
C. Only 2s and 2p may hybridize; these orbitals contain valence electrons used in bonding.
Explanation:
Carbon has four valence electrons (2s² 2p²), in several organic compounds it forms four bonds and as this element has two types of orbitals to join, 2s and 2p, it is expected that a compound like methane has two types of C-H bonds, but this is not the case, as all its orbital atoms are the same.
In a process called hybridization, s orbitals and p orbitals are combined in an atom. Depending on the amount of p orbitals that are combined, the hybrid orbitals can be sp (one orbital 2s and one 2p are combined), sp² (the 2s orbital combines with two 2p orbitals) and sp³(the orbital 2s combines with three 2p orbitals).
The carbon atom has the presence of 6 electrons. The valence bond theory hybridized the 2s and 2p orbital for the bonding, as they have valence bonds.
What is valence bond theory?The valence bond theory has been the atomic hybridization of the atoms that results in the formation of the bonds.
The carbon atom has 4 valence electrons present in the bonding valence orbitals. The orbitals combine as sp, sp2, sp3 orbital in order to form the bond.
Thus, since there has been the presence of valence electrons in the s and p orbitals, the 2s and 2p are involved in the hybridization. Hence, option C is correct.
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How many grams of methane gas occupy a volume of 11.2 liters at stp
Answer:
see the pic for the answer
7.91 grams of methane gas occupy a volume of 11.2 liters at STP.
What is STP?
Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.
First, we need to calculate the number of moles:
STP is 0 °C and 1 bar.
One mole of a gas at STP has a volume of 22.71 L .
Moles of CH₄ = 11.2 L × ([tex]\frac{1 mol}{22.71 L}[/tex])
Moles of CH₄ = 0.4932 mol
Now we will calculate the mass of CH₄
Moles = [tex]\frac{mass}{molar \;mass}\\[/tex]
Mass of CH₄ = 0.4932 × 16.03
Mass of CH₄ = 7.91 g
Hence, 7.91 grams of methane gas occupy a volume of 11.2 liters at STP.
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what is the molar ratio of h2 to h2o
Answer:
The balanced equation is 2H2 + O2 –> 2 H2O. It takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1.
Answer:
2:1
Explanation:
I forgot the explanation of this, but I remembered the answer
A binding protein binds to a ligand L with a Kd of 400 nM. What is the concentration of ligand when Y is (a) 0.25, (b) 0.6, (c) 0.95?
Answers: (a) 133.33nm (b) 600nm (c) 7,600nm
Answers above are correct. Please show all steps, really trying to understand.
Answer:
(a) 133.33nm
(b) 600nm
(c) 7,600nm
Explanation:
The concentration of Y can be determined by using the formula:
[tex]Y = \dfrac{[L]}{k_d+[L]}[/tex]
where;
[L] = concentration of the binding ligand.
kd = 400 nm
Thus:
When Y = 0.25; we get :
[tex]0.25 = \dfrac{[L]}{400+[L]}[/tex]
0.25 (400 + [L]) = [L]
100 + 0.25[L] = [L]
100 = [L] - 0.25 [L]
100 = 0.75 [L]
[L] = 100/0.75
[L] = 133.33 nm
At, Y = 0.6
[tex]0.6 = \dfrac{[L]}{400+[L]}[/tex]
0.6 (400 + [L]) = [L]
240 + 0.6[L] = [L]
240 = [L] - 0.6 [L]
240 = 0.4 [L]
[L] = 240/0.4
[L] = 600 nm
At, Y = 0.95
[tex]0.95 = \dfrac{[L]}{400+[L]}[/tex]
0.95 (400 + [L]) = [L]
380 + 0.95[L] = [L]
380 = [L] - 0.95 [L]
380 = 0.05 [L]
[L] = 380/0.05
[L] = 7600 nm
1. How is 120,700 written in scientific notation?
A. 120.7. 103
B. 12.07. 104
C. 1.207.105
D. 0.1207.106
Answer:
Option B
Explanation:
In order to find the answer to this question you need to move the decimal point as many times as the exponent, positive exponent to the right and negative exponent to the left. In this case we have all positive exponents meaning we move all of them to the right but they all equal the same thing. The most logical answer to this question is option B "10.07×10^4" because the equation is balanced.
Hope this helps.
What are the oxidation numbers of the atoms in this reaction?
Check all that apply.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
0 for Mg in Mg and MgCl2
0 for Mg(s) and H in H2
+1 for H in HCl
-1 for Cl in HCl
+2 for Mg in MgCl2
Answer:
2-5
Explanation:
I just did it.
The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂
What is oxidation number?An oxidation number is a number assigned to atoms in molecules to show the general distribution of the electrons.
Oxidation state or number helps us describe the transfer of electrons.
The oxidation number/state is also used to determine the changes that occur in redox reactions.
Overall, the oxidation number of an atom in a molecule is the charge that the atom would have if all polar covalent and ionic bonds resulted in a complete transfer of electrons from the less electronegative atom to the more electronegative one.
Therefore, The oxidation numbers of the atoms in this reaction are 0 for Mg(s) and H in H₂, -1 for Cl in HCl, +1 for H in HCl and +2 for Mg in MgCl₂
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In which statement does the word theory mean scientific theory?? A) In theory, the experiment will work as planned. B) She has a theory about why the storm arrived later than predicted. C) The atomic theory explains that material objects are made up of atoms. D) The doctor’s prescription for curing a cold is based on his best theory or guess.
Answer: C
Explanation:
I took a quiz on this.
NEED ANSWERS NOW 100 PTS
Is iron iii fluoride ionic or covalent
Is carbon disulfide ionic or covalent
Answer:
iron i believe is ionic and carbon is covalent
Explanation:
if im wrong correct me
What causes your skin to feel warm when it is in the sun on a summer day?
A Particles in the atmosphere reflect energy from the Sun downward.
B Hot particles from the Sun still carry some heat when they reach your skin.
C The solar wind carries heated air from the Sun's atmosphere to Earth's surface.
D The Sun radiates energy that passes through space and the atmosphere to your skin.
Answer:
idek akxkkwskkd nwkdkekekd
I NEED HELP THIS IS FROM MY HOMWORK DUE IN A HOUR
Answer:
Increasing the speed of the particles
Explanation:
The energy absorbed in the phase B is used to increase the speed of the particles.
We can see a positive slope which shows that the temperature is increasing considerably with increasing time.
At this phase the reaction rate is become faster as the temperature change has a considerable effect on reaction rates.
Temperature is directly proportional to the average kinetic energy of reacting particles.
Help me I’ll do anything
Answer:
its not A B or C soo choose D *This is what i think*
Answer:
A) something that causes physical pain
hope this helps
Explanation:
How many grams of hydrogen chloride are in 50. mL of 11 M HCl solution?
Answer:
20,075 g
Explanation:
Solution at attachment box
Firstly i found the mole of HCLwhich we needed
After that I found the gram of HCL which we needed
M.V=n
The mass of hydrogen chloride present in 50. mL of 11 M HCl solution is 20.08g. Details about mass can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
However, the number of moles of Hydrogen chloride must be calculated first as follows:
Molarity = no of moles/volume
no of moles = 11M × 0.05L
no of moles = 0.55mol
mass of HCl = 0.55 mol × 36.5g/mol
mass of HCl = 20.08g
Therefore, the mass of hydrogen chloride present in 50. mL of 11 M HCl solution is 20.08g.
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Help with 3.A and B image provided below
a. P=0.971 atm=737.6 mmHg
b. n=2.88 x 10⁻³
Further explanationDalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
[tex]\tt P_T=P_1+P_2+..P_n[/tex]
A. vapor pressure of water at 22.5 = 20.4 mmHg
Pt=P H₂ + P H₂O
758 = P H₂ + 20.4
P H₂=737.6 mmHg=0.971 atm
B.Ideal gas Law = PV=nRT
P = 0.971 atm
V = 72 ml = 0.072 L
R = 0.082 L/atm mol
T = 22.5 + 273.15 =295.65
[tex]\tt n=\dfrac{0.971\times 0.072}{0.082\times 295.65}=2.88\times 10^{-3}[/tex]
